Why is the runway so small?

@HunPredator017 hydrolox has the least burn time, kerolox has the most burn time

@aripander yeah probably
But it is weird
I wanted to make a small 2 stage rocket
But I could fix the problem when used 2 nuclear engines with water as propellant
And way better fuel than hydrogen
I could pack 4 minutes worth of fuel in a small ship with 0.6 twr and 2 engines in sea level
With a big enough ship I can make something like a nuclear SSTO

@SupremeDorian my question is that is there a second, shorter runway off to the right of the first one?

@HunPredator017 you might need larger fuel tanks

The runway at the KSC (RL KSC) is 4.5 KM long, I feel it should bee that long too. Just my opinon

All things enabled in all tanks
Normally the 4 methane mage engines will work more than a minute, but now just 4 second and shutting down
The nuclear ones are just 23 seconds as well, and not minutes
I don't know what is happening

Make sure to enable fuel line in the settings of the tank @HunPredator017

How I can make a rocket normally with 2 engine/fuel types?
I stacked LH2 and methalox tanks, but the nuclear engines not draining the hydrogen, the other engines the methane
Below the LH2 tank has 2 smaller ones with methane.
The engines just draining the small tanks and shutting down in seconds, but the big ones are full, and the engines not draining them. Why this is happening? Maybe the small tanks causing the problem?
I am playing on android, I don't know where to write from these things, so I wrote here.

Because the runway is unusually wide (80m), it gives the illusion that it is a short runway, also this gives the illusion that your aircraft is lower than necessary during a correct approach, and so a common mistake (that I have also made) is to overcompensate by taking a higher approach, which leads to touchdown much farther down the runway, but this shortens your effective runway length. With the correct airspeed on short final (should be just over stall speed), aim for the runway threshold (I aim just before it), and during the flare you should be touching down right on the touchdown zone. Use this IMAGE below for reference.

Aircraft in this game do not actually need very long runways, but 2km of runway is enough for all aircraft, but you have to make sure you have a low approach airspeed and touch down in the touchdown zone or the demarcation area before the touchdown zone.

HERE is an interesting article on visual illusions caused by unusually wide runways.

For the main question, the Runway is 2km long so that should be plenty for landing. If it isn't, just have some parachutes on the back of your plane. For the second question, no there are not guns and there likely never will be.